I give to an organization that gives to both.
I agree with speed racer.
If its a non-horse person, I tell them horses and the lifestyle make up everything I am and everything that makes me happy (along with my son, who is number 1) If they respect who I am, then they will accept that answer. If it's a horse person, I usually don't need to explain anything! Lol Usually, they know as well as I do that it's hard to put a feeling like this into words. It's a mutual understanding.
There are a lot of people who don't get it. Sometimes, after time, they will learn to respect it after observing how much horses benefit our lives. My mom was completely against it. Now she says I've chosen the perfect path.